Scintillators Based on CdWO₄ and CdWO₄\!\!:\!\!Bi Single Crystalline Films

This research is directed on creating by liquid phase epitaxy the single crystalline film scintillators based on undoped and Bi doped CdWO4compounds as well as the phoswich detector based on “CdWO4:Bi or CdWO4films/CdWO4or CdWO4:Bi crystals” epitaxial structures. The luminescent and scintillation properties of the undoped and Bi3+doped (in a concentration range of 0.04-0.25 at. %) CdWO4films, grown by LPE method from Na2WO4flux, were compared with the properties of CdWO4bulk crystal analogs, grown from melts by the Czochralski method. Using the traditional luminescence spectroscopy and the luminescence spectroscopy under excitation by pulsed synchrotron radiation with energy in the fundamental absorption range of CdWO4host, we have also examined the nature of different emission centers and studied energy transfer processes from tungstate hosts to Bi3+ions and defect centers in CdWO4and CdWO4:Bi films and their crystal analogs.